Malicious PDF — malware analysis report

Static analysis result for SHA-256 810f5e928363642e…

MALICIOUS

PDF

82.4 KB Created: 2021-02-17 13:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2396b66dd8aaf7885f42d7a903be8ab0 SHA-1: c61063ff231158a58945c3a0543a9eaca7c39fae SHA-256: 810f5e928363642e0ab91a07d9e1977f2d35766c2f767d7dceea07024cb95378
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs implies the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/strik?utm_term=britax+marathon+convertible+car+seat+forward+facing PDF link annotation
    • https://cdn.sqhk.co/kinemefuwa/jdjggka/bits_and_bolts_art.pdfIn PDF document text
    • https://ruwuragawani.weebly.com/uploads/1/3/4/3/134383911/lexujawokewasox-laparaj-zaposavo.pdfIn PDF document text
    • http://poverkavoda.website/wosazovotanujasavixededzemaq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fcc5de8c9949.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/cbd202beb79ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454045/normal_5ffbbc41d1989.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fc5acf0c99ba.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/winimi_winariwixexixed_retawaludagi.pdfIn PDF document text
    • https://fetuxugov.weebly.com/uploads/1/3/4/6/134655394/sejelufive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496580/normal_6006b84ab1c10.pdfIn PDF document text
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/nadepom.pdfIn PDF document text
    • https://danegatazi.weebly.com/uploads/1/3/0/7/130776269/694f545de1fbe.pdfIn PDF document text
    • http://ighelpcenter.xyz/coordinate_geometry_class_10_ncert3l0k1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 5844 bytes
SHA-256: 4add583ec2d59a30855ff81dd96a2efb66db38eb182c860a6a189d500dd53d50
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 10988 bytes
SHA-256: 09f0d1320269c78e3a72952911111c9dd7596d29f2b93354f5bedbc23f22bf9c
font_02_sfnt_off00012696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12696 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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